Measurement of the polarization parameter of the reactionsπ− p → π0n and ηn at 5 and 8 GeV/c |
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Authors: | P. Bonamy P. Borgeaud M. Crozon J.P. Guillaud O. Guisan P. Le Du P. Sonderegger J.K. Bienlein S. Mango L. Paul H. Dinter |
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Affiliation: | Départment de Physique des Particules Elémentaires, CEN-SACLAY, France;Deutsches Elektronen Synchrotron DESY, Hamburg, Germany |
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Abstract: | Measurements of the polarization parameter of the reactions π?p → π0n and π?p → ηn at 4.90 and 7.85 GeV/c and for a squared four-momentum transfer ?t ranging from 0.1 to 2.0 (GeV/c)2 have been achieved by using a butanol polarized proton target and detecting only the two γ's from the neutral meson decay. The background due to events involving bound protons has been separately measured and subtracted out. A large positive polarization has been found for the reaction π?p → π0n. It is consistent with other pion-nucleon scattering data connected by isospin conservation. The polarization for the reaction π?p → ηn is not significantly different from zero within the large experimental errors. |
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